Nozzle for fluid injection

ABSTRACT

A mixer pump suitable for, but not restricted to, use in pumping water from a receiving tank in a municipal water supply system or the like and including means for separately injecting a plurality of chemical treating agents or the like into the water being pumped. In the illustrated embodiment, means are provided for separately injecting a plurality of chemical treating agents each at a plurality of spaced locations into the water stream on the suction side of the pump impeller whereby the chemical treating agents in passing through the impeller are intimately mixed with the water; and means are additionally provided for separately injecting a plurality of additional chemical treating agents each at a plurality of spaced locations into the interior of the pump housing on the discharge side of (i.e., downstream of) the impeller, particularly on the discharge side of the pump diffuser if there is a pump diffuser.

United States aten [191 Weltmer Nov. 11, 1975 Related U.S. ApplicationData [62] Division of Ser. No. 212,300. Dec. 27, 1971, Pat. No.

[75] Inventor:

[52] US. Cl. 137/604; 239/598; 239/599 [51] Int. C1. F16K 19/00 [58]Field of Search 137/604; 259/4; 417/84;

239/398, 407, 428, 429, 430, 433, 592-595, 597-599; 261/76, 78 A, 78 R,DIG. 39, DIG.

[56] References Cited UNITED STATES PATENTS 2.219.616' 10/1940 Bradshaw137/604 2,361,150 10/1944 Petroe 137/604 X 2.613999 10/1952 Sher et a1239/429 X 2,681,216 6/1954 Knecht 239/433 X 2,772,863 12/1956 Harney etal. 417/84 X Primary Examiner-Robert G. Nilson Attorney, Agent, orFirmRobert C. Sullivan 5 7 ABSTRACT A mixer pump suitable for, but notrestricted to, use in pumping water from a receiving tank in a municipalwater supply system or the like and including means for separatelyinjecting a plurality of chemical treating agents or the like into thewater being pumped. In the illustrated embodiment, means are providedfor separately injecting a plurality of chemical treating agents each ata plurality of spaced locations into the water stream on the suctionside of the pump impeller whereby the chemical treating agents inpassing through the impeller are intimately mixed with the water; andmeans are additionally provided for separately injecting a plurality ofadditional chemical treating agents each at a plurality of spacedlocations into the interior of the pump housing on the discharge side of(i.e., downstream of) the impeller, particularly on the discharge sideof the pump diffuser if there is a pump diffuser.

1 Claim, 9 Drawing Figures U.S. Patent Nov. 11, 1975 Sheet 1 of43,918,491

U.S. Patent Nov. 11, 1975 Sheet2 of4 3,918,491

U.S. Patent Nov.l1,1975 Sheet30f4 3,918,491

US. Patent Nov. 11, 1975 Sheet4of4 3,918,491

NOZZLE FOR FLUID INJECTION RELATED PATENTS This application is adivision of US. Pat. application Ser. No. 212,300, entitled Mixer Pump,filed Dec. 27, 1971, which issued as U.S. Pat. No. 3,836,126 on Sept.17, 1974.

BACKGROUND OF THE INVENTION Field of the Invention This inventionrelates to a mixer pump for pumping a fluid such as water or the likeand including means for injecting one or more chemical treating agentsor the like into the fluid stream passing through the pump.

Although not restricted to such use, the invention has particularutility when applied in connection with a mixer pump used for pumpingwater in a municipal water supply and including means associated withthe pump for injecting chemical treating agents or the like into thestream of water passing through the pump. However, in its broaderaspects, the invention is applicable to any application, such as achemical process or the like, for example, in which a mixer pump mightbe used to inject chemical treating agents or the like into a fluidstream being pumped by the mixer pump.

A mixer pump in accordance with an embodiment of the invention may be ofthe order of magnitude of 37 feet high, for example, and be capable ofpumping 96,000 gallons of water per minute. The chemical injectionapparatus associated with the pump may for example, be capable ofinjecting a plurality (such as five) different treating agents each at aplurality (such as two) different injection locations in the region ofthesuction end of the pump; and also be capable of injecting anadditional and different plurality (such as five) different treatingagents each at a plurality (such as four) different injection locationswithin the pump structure on the discharge side of (i.e., downstream of)the pump impeller, particularly on the discharge side of the pumpdiffuser if there is a pump diffuser. In the example just cited, fivedifferent treating agents may be injected at a total of ten differentinjection locations on the suction side of the pump impeller; and fiveadditional and different treating agents may be injected at a total oftwenty different injection locations on the discharge side of the pumpimpeller.

DESCRIPTION OF THE PRIOR ART In purifying the water of a municipal watersupply it is known to inject one or more chemical treating agents intothe water where the water flows into a receiving tank or pool from areservoir or the like. In at least one municipal water supplyinstallation of which I am aware the water having the chemical treatingagent or agents therein is conducted to a large area receiving basinhaving a number oflabyrinth-like flow passages for the water. Theselabyrinth-like flow passages, combined with a long residence time of thewater in the labyrinth basin, promotes molecular diffusion of thetreating agents through the water being treated. An installation of thetype just described requires a large area for its installation, such asone-half acre, for example. Thus, the prior art type of waterpurification system of the type just mentioned is objectionable (1)because it is time consuming by reason of the long residence timerequired for the water in the labyrinth basin to promote moleculardiffusion of the treating agent into the water; and

(2) the space requirement for a prior art installation of the type justdescribed is frequently undesirable in an urban area where real estateprices are a factor to be considered.

SUMMARY OF THE INVENTION Accordingly, it is an object of the inventionto provide a mixer pump adapted for, but not restricted to, use in amunicipal water supply system or the like, in cluding means forinjecting at least one chemical treating agent or the like on thesuction side of the pumping element of the pump, whereby to promoteintimate diffusion of the chemical treating agent with the liquid beingtreated.

It is another object of the invention to provide a mixer pump which isadapted to pump a fluid such as water and further including means forinjecting at least one chemical treating agent or the like into thefluid stream passing through the pump on the suction side of the pumpimpeller and also for injecting at least one chemical treating agentinto the fluid stream on the discharge side of the pump impeller,particularly on the discharge side of the pump diffuser if there is apump diffuser.

It is a further object of the invention to provide a mixer pump which isadapted to pump a fluid such as water, and further including means forseparately injecting a plurality of chemical treating agents into thefluid stream passing through the pump on the suction side of the pumpimpeller and also for separately injecting a plurality of chemicaltreating agents into the fluid stream within the pump housing on thedischarge side of the pump impeller, particularly on the discharge sideof the pump diffuser if there is a pump diffuser.

It is a further object of the invention to provide a mixer pump adaptedfor, but not restricted to, pumping water in a municipal water supplysystem or the like which is adapted to permit injection into the waterof at least one chemical treating agent or the like on the suction sideof the pump impeller and to permit the injection into the water of atleast one chemical treating agent or the like on the discharge ordownstream side of the pump impeller, particularly on the discharge sideof the pump diffuser if there is a pump diffuser.

It is a further object of the invention to provide a mixer pump which isadapted to permit injection into the fluid being pumped of at least onechemical treating agent or the like, either on the suction side of thepump impeller, or on the discharge side of the pump impeller, or on bothsides of the pump impeller, and further including means for insuringcircumferential and inward distribution of each treating agent into thefluid being pumped.

In achievement of these objectives, there is provided in accordance withan embodiment of the invention a mixer pump suitable for, but notrestricted to, use in pumping water from a receiving tank in a municipalwater supply system or the like and including means for separatelyinjecting a plurality of chemical treating agents or the like into thewater being pumped, In the illustrated embodiment, means are providedfor separately injecting at least one chemical treating agent into thewater stream on the suction side of the pump impeller whereby thechemical treating agent in passing through the impeller is intimatelymixed with the water; and means are additionally provided for separatelyinjecting at least one additional chemical treating agent into theinterior of the pump housing on the discharge side of the impeller,(i.e., downstream of the impeller), particularly on the discharge sideof the pump diffuser if there is a pump diffuser.

BRIEF DESCRIPTION OF THE DRAWINGS Further objects and advantages of theinvention will become apparent from the following description taken inconjunction with the accompanying drawings in which:

FIG. I is a view in vertical elevation, partially broken away, of themixer pump assembly of the invention;

FIG. 2 is a fragmentary view in vertical elevation showing details ofthe chemical injection piping contiguous the suction end of the pumpassembly;

FIG. 3 is a view in horizontal section along line III- --III of FIG. 2,rotated 90 in a clockwise direction;

FIG. 4 is a view in side elevation of the vaned scoop portion oftheassembly of FIG. 2 showing the chemical injection assembly mountedthereon;

FIG. 5 is a view in side elevation of the chemical injection pipingmounted on the pump housing on the discharge side of the pump impeller,and, more specifically, on the discharge side ofthe diffuser;

FIG. 6 is a view in horizontal section along line VI-VI of FIG. 5;

FIG. 7 is a detail view in section of one of the chemical injectionnozzles of FIGS. 1-6, inclusive;

FIG. 8 is a view in section along line VIII-VIII of FIG. 7; and,

FIG. 9 is a view in elevation, partially cut away, showing a modifiedarrangement of the chemical injection assembly contiguous the suctionend of the pump.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings,and more particularly to FIG. 1, there is shown a mixer pump assembly inaccordance with an embodiment of the invention which is adapted to serveas a mixer pump in the water supply system of a large municipality. Thepump assembly generally indicated at 10 in a typical embodiment may havea vertical dimension, for example, of the order of magnitude of 37 feet,an internal diameter of the order of magnitude of 5 feet in the portionthereof above the suction bell, and may have a pumping capacity of theorder of magnitude, for example, of 96,000 gallons of water per minute,with a propeller rotating at 300 RPM. The pump 10 is immersed at leastat the lower portion thereof in a receiving tank or pool generallyindicated at 12 which may be hydraulically connected to one or moreremotely located water reservoirs which supply water to receiving tankor pool 12.

The lower end of the pump housing which is immersed in the body of waterwithin receiving tank or pool 12 terminates in an open ended vaned scoop14 through which water in-receiving tank 12 flows to the interior of thepump housing. Vanes 15 mounted on vaned scoop 14 at the inlet endthereof direct water upwardly into the vaned scoop 14. The upper end ofvaned scoop 14 is connected to a sunction bell l6. Vertically positionedabove and suitably joined to suction bell 16 is impeller wearingcylinder 18 within which the pump impeller or propeller 28 is mountedfor rotation. Vertically positioned above and suitably joined to theupper end of wearing cylinder 18 is the housing 20 within which thestationary vanes 33 of the diffuser generally indicated at 29 and thepump drive shaft bearing assembly 31 are mounted. Vertically positionedabove and suitably connected to the upper end of the housing 20 arelower and upper pipe columns 22 and 24 respectively. A discharge elbow26 is secured to the upper end of upper pipe column 24. The vaned scoopl4, suction bell l6, impeller wearing cylinder 18, diffuser and bearingassembly housing 20, upper and lowe pipe columns 22 and 24 and thedischarge elbow 26 when assembled together constitute what may bereferred to as the pump housing. The water which is pumped by pumpassembly 10 due to the action of propeller 28 enters the pump housingthrough vaned scoop 14, passes upwardly through the pump housing, anddischarges through discharge elbow 26 into a suitable conduit or thelike connected to discharge elbow 26.

Propeller or impeller 28 is suitably mounted for rotation within theinterior of impeller wearing cylinder 18. The impeller or propeller 28is connected to a shaft 30 which is connected to a drive means such as adrive motor mounted on the motor pedestal 32 which is mounted at theupper end of the upper pipe column 24.

Diffuser 29 comprises a plurality of stationary diffuser vanes 33mounted in circumferentially spaced relation to each other on theinterior of the diffuser and bearing assembly housing 20 at thedischarge end of impeller 28 for the purpose of reacting with the waterdischarged from the impeller to change some of the kinetic energy in thewater to potential energy, in a manner well known in the art.

DESCRIPTION OF CHEMICAL INJECTION ASSEMBLY FOR SUCTION END OF PUMP Meansare provided which will now be described for injecting chemical treatingagents or the like at a plurality of spaced locations at the suction endof the pump assembly.

In the embodiment shown in FIGS. 1, 2, 3 and 4, manifold, piping, anddischarge nozzle means are provided for injecting a total of fivedifferent chemical treating agents each at two different spacedlocations at the suction end of the pump assembly. Thus, manifoldsindicated at 32A, 32B, 32C, 32D and 32E are mounted in verticallysuperposed spaced relation to each other on the outer wall of diffuserand hearing assembly housing 20 by means of suitable support brackets34. Each of the manifolds 32A 32E, inclusive, is provided with acorresponding inlet port 36A, 36B, 36C, 36D and 36E, respectively,through which the chemical treating agent corresponding to eachrespective manifold is admitted from a source not shown. Thus, the useof five separate manifolds each having its own corresponding inlet portpermits each of the five manifolds 32A 32E, inclusive, to be separatelyconnected to a source of a separate and distinct chemical treatingagent, if desired. Pipes generally indicated at 41 (FIG. 1) connect therespective manifolds 32A 32E, inclusive, to their corresponding sourcesof treating agent.

In the illustrated embodiment, each of the manifolds 32A 32E, inclusive,extends in a horizontal plane peripherally of the pump housing by anangle of substantially degrees. Corresponding ends of the plurality ofmanifolds 32A, etc., are offset or spaced from each othercircumferentially of the pump housing. Each of the manifolds 32A 32E,inclusive, communicates at each of the two opposite circumferential endsthereof with a corresponding vertical pipe connected at its lower end toan inlet port to which is connected a corresponding chemical injectionnozzle 45. Each injection nozzle 45 extends a substantial distanceinwardly into the hollow interior of the vaned scoop and thus into thepath of water flow through vaned scoop 14. Thus, in the illustratedembodiment, each manifold 32A 32E, inclusive, supplies a chemicaltreating agent to two injection nozzles 45.

More specifically, in the illustrated embodiment, as seen in FIG. 4, theside wall of the vaned scoop 14 is provided with five circumferentiallyand vertically spaced flanged inlet ports for the injection of chemicalsor other treating agents for the water supply. These inlet ports areindicated at 38E, 38D, 38C, 38B and 38A, respectively. The inlet port38E is positioned at the highest level of the five ports just mentioned,and the other ports are arranged at progressively lower levels withrespect to the vertical axis of the pump structure.

On the opposite wall portion of the vaned scoop, as best seen in theviews of FIGS. 2 and 3, similar ports 38A, 38B, 38C, 38D'- and 38E arerespectively positioned in the same relative positions as the respectiveports 38E, 38D, 38C, 388 and 38A, in the order named. Manifold 32A isconnected at the opposite ends thereof through downwardly extendingvertical pipes 40A and 40A to the respective injection inlet ports 38Aand 38A. Similarly, manifold 32B is connected at the opposite endsthereof by vertical pipes 408 and 408 to injection inlet ports 38B and38B; manifold 32C is connected at the opposite ends thereof to injectioninlet ports 38C and 38C by vertical pipes 40C and 40C; manifold 32D isconnected at the opposite ends thereof to the injection inlet ports 38Dand 38D by vertical pipes 40D and 40D; and manifold 32E is connected atthe opposite ends thereof to injection inlet ports 38E and 38E byvertical pipes 40E and 40E. Each of the vertical pipes 40A 40E,inclusive, and 40A'- 40E, inclusive, is connected at the lower endthereof to a corresponding elbow 42 which is received in thecorresponding ported opening in the wall of the vaned scoop.

An injection nozzle 45 best seen in FIG. 7 of the drawings, is securedat the radially outer end thereof in the respective elbow fitting 42 ofeach of the inlet ports 38A 38E, inclusive, and 38A 38E, inclusive, theradially outer end portion of the nozzle being of circular cross sectionin the region where it is secured to elbow fitting 42. The nozzle 45 isflattened for most of its length to include two flat spaced oppositewalls 46 connected by arcuate top and bottom portions 48 as best seen inFIG. 8. By elongating the cross section of the nozzle in the directionof the main fluid flow through the pump as seen in the cross sectionalview of FIG. 8, hydraulic losses in the liquid being pumped are reduced.The radially inner end portion of the nozzle is cut at a bias so thatthe upwardly open discharge end 51 of the nozzle makes an angle ofapproximately 30 degrees relative to the longitudinal edges 48 of thenozzle. The elongated upwardly open discharge end 51 provides adistribution along a substantial distance inwardly into the fluid streampassing through the pump of the treating agent which flows through eachrespective nozzle.

It can be seen from the foregoing description and from the drawings,particularly FIGS. 2, 3 and 4, that there is provided in the illustratedembodiment means for injecting five different chemical treating agentsinto the water flowing into the vaned scoop end of the pump structure atthe suction end of the pump since a total of five separate manifolds forthe different chemicals being injected are provided at 32A 32E,inclusive, each manifold being connected to two diametrically oppositeinjection ports on opposite wall portions of the vaned scoop and thus totwo diametrically opposite injection nozzles 45 which extend inwardlyinto the interior of the vaned scoop and thus inwardly into the fluidstream passing through the vaned scoop. The various chemical treatingagents or the like injected into the fluid stream on the suction side ofthe impeller as well as on the discharge side of the impeller (to bedescribed) may be in liquid state or be carried by a liquid carriermedium. The various treating agents injected through any of the nozzles45 on either side of the impeller may be suitably pressurized, asrequired.

Since the chemical treating agents introduced into the water flowthrough the plurality of manifolds and inlet ports at the suction end ofthe pump, as just described, must pass through the impeller or propeller28, any chemicals introduced through the inlet ports just described onthe suction side of the impeller 28 are thoroughly mixed into the liquidstream by the action of the rotating impeller 28, to thereby promotemolecular diffusion of the treating agents into the water being treated.For this reason, in determining which chemicals are to be introducedinto the water flow on the suction side of the pump impeller and whichchemicals are to be introduced into the water flow on the discharge sideof the pump impeller, it is advantageous to select from the chemicaltreating agents which it is desired to inject into the water, thosechemical treating agents which require more thorough mixing forinjection on the suction side of the pump.

Means are also provided for separately injecting a plurality ofdifferent chemical treating agents or the like within the interior ofthe pump structure but on the discharge side of, (i.e., downstream of)the impeller 28, and more specifically in the illustrated embodiment, onthe discharge side of diffuser 29. Thus, as best seen in FIGS. 1, 5 and6, a plurality of fluid manifolds 50A, 50B, 50C, 50D and 50E aresuitably mounted on the outer wall surface of lower pipe column 22 whichforms part of the pump housing structure, the fluid manifolds 50A 50E,inclusive, each respectively lying in a separate horizontal plane whichis vertically spaced from the planes of the other manifolds in thisgroup. Each of the manifolds 50A 50E, inclusive, is provided with aninlet port respectively designated at 52A, 52B, 52C, 52D and 52E throughwhich separate and distinct chemical treating agents from differentsources may be admitted by one of the pipes 55 (FIG. I) for distributionby the respective manifolds 50A 50E, inclusive. Each of the respectivemanifolds 50A 50E, inclusive, extends for substantially 270 around theperiphery of the lower pipe column 22. At each opposite end of eachmanifold and also at circumferentially spaced peripheral locations oneach manifold, each manifold is provided with a suitable fitting whichextends through an inlet passage in the wall of the lower pipe column 22at aheight corresponding to the respective manifold, and a chemicalinjection nozzle 45' of the type previously described and shown indetail in FIG. 7, and which extendsradially inwardly a substantialdistancc into the path offluid flow through lower pipe column 22, issuitably connected in fluid communication with the correspondingmanifold at each such inlet fitting. Thus, each manifold 50A 50E,inclusive. is connected to four injection nozzles 45 to permit injectionthrough the elongated discharge opening 51 of the respective nozzles ofthe particular chemical treating agent supplied by the respectivemanifolds, 50A 50E, inclusive, into the stream of water within the pumphousing at 90 degree cirumferentially spaced locations in a givenhorizontal plane corresponding to each respective manifold 50A 50E,inclusive. It can be seen, therefore, that on the discharge ordownstream side of the pump impeller, and more particularly, at alocation downstream of, but contiguous the discharge end of diffuser 29,means are provided for separately injecting five different chemicaltreating agents or the like, each at four different injection locationsfor a total of twenty different injection locations on the dischargeside of the pump impeller, More specifically, the location of injectionnozzles 45 downstream of but contiguous the discharge end of diffuser 29insures that the treating agents are injected into the fluid passingthrough the pump at a region where the fluid being pumped issufficiently turbulent to insure good mixing of the respective treatingagents with the fluid being pumped.

It can be seen from the foregoing, that there is provided in accordancewith the present invention, a mixing or blending pump which isparticularly suitable for, although not restricted to, pumping water ina municipal water supply and at the same time for mixing and blendingchemical treating agents with the water as required. In accordance withthe invention, means are provided for separately injecting a pluralityof different chemical treating agents into the stream of water on thesuction side of the impeller so these chemicals will be thoroughly mixedinto the water stream by the action of the impeller; and also forseparately injecting a plurality of chemical treating agents into thestream of water within the pump housing but on the discharge side of(i.e., downstream of), the impeller, particularly on the discharge sideof the pump diffuser if there is a pump diffuser.

It can also be seen from the foregoing that the arrangement of themanifolds 32A 32E, inclusive, of injection inlet ports 38A 38E and 38A'38E, and of the injection nozzles 45 corresponding thereto, is such thateach treating agent of the manifolds just mentioned is injected into thefluid stream on the suction side of the impeller of substantiallydiametrically opposite circumferential locations when viewed inhorizontal projection. Also, the laterally inward projection of nozzles45 into the stream of fluid being pumped, together with the provision ofthe elongated upwardly open discharge end 51 of each nozzle 45, insuresa laterally inward distribution of the treating agent into the fluidstream on the suction side of the pump impeller.

Also, the arrangement of the manifolds 50A 50E, and of the injectionnozzles 45 and nozzle discharge openings 51' corresponding theretoinsures both circumferential and radially inward distribution of eachrespective treating agent into the fluid stream at the injectionlocations downstream of impeller 28, and, more particularly, in theillustrated embodiment, on the discharge side of diffuser 29.

While the injection nozzles at the suction end of the pump in theillustrated embodiment have been shown and described as being mounted onthe vaned scoop attached to the lower end of the suction bell, incertain applications, the vaned scoop may not be used, in which case,the chemical injection nozzles and ports on the suction side of theimpeller may be mounted instead on the suction bell 16.

There is illustrated in FIG. 9 a modified mounting arrangement for thechemical injection means on the suction side of the impeller. Thus, inFIG. 9 there is shown the lower end of suction bell generally indicatedat 102 of a pump which may be similar to the one shown in FIG. 1 of thedrawing except that no vaned scoop is provided at the lower end ofsuction bell 102. Pump 100 includes an impeller 28 and a diffuser 29.The pump is suitably supported within a receiving tank 103 similar tothe tank 12 described in connection with the embodiment of FIG. 1. Tank103 has a floor or base portion 104 and the lower end of suction bell102 is elevated a distance such as four feet, for example, above surface104. In accordance with the modified arrangement shown in FIG. 9, thefluid manifolds schematically indicated at 106 and 108 having dischargeorifices 106A and 108A which are in fluid communication with theinterior of the respective manifolds 106 and 108, are suitably mountedon support structure 112 in the space between the lower end of suctionbell 102 and tank surface 104. Manifolds 106 and 108 and the dischargeoriflces 106A and 108A thereof are so positioned as to be in the inletflow stream of water entering the suction bell 102. Support structure112 is supported by floor 104 of tank 103. Manifolds 106 and 108 may beconnected to separate sources of different chemical treating agents orthe like.

The pump 100 of the modified embodiment of FIG. 9 is otherwise similarto the structure shown in FIG. 1 and, as in the embodiment of FIG. 1, isalso provided with chemical treating agent injection means within thepump housing on the discharge side of the pump impeller, as previouslydescribed.

The term tank as used in the specification and claims is intended tocover any means for holding a body of water which is acted upon by thepump, such as a tank, basin, reservoir, pool or the like.

The mixer pump constructions hereinbefore described and shown in FIGS. 19, have the advantage when applied to a municipal water supply system orthe like that they may be used with existing water supply systems topump and to chemically treat the water, and serve to upgrade the qualityof such existing systems while at the same time considerably reducingboth the treatment time required and the size of the physical plantrequired.

While the mixer pump of the invention has been described as embodied ina mixer pump used in pumping and treating water in a municipal watersupply system or the like, it is obvious that the mixer pumphereinbefore described is useful in any application or environment, suchas a chemical process or the like, for example, in which a mixer pumpmight be used to inject chemical treating agents or the like into afluid stream being pumped by the mixer pump.

From the foregoing detailed description of the pres ent invention, ithas been shown how the objects of the invention have been obtained in apreferred manner. However, modifications and equivalents of thedisclosed concepts such as readily occur to those skilled in the art areintended to be included within the scope of this invention.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. An injection nozzle for use in injecting a treating agent or the likeinto a fluid stream passing through a conduit or the like, saidinjection nozzle being adapted to be mounted with its longitudinal axisextending in a direction inwardly of the periphery of said conduit orthe like and into said stream, said nozzle including a discharge openingwhich is cut on a bias relative to the longitudinal axis of said nozzle,whereby said discharge opening is elongated in said direction todistribute the treating agent into said fluid stream along an elongatedpath extending in said direction, said injection nozzle including ahollow fluid passage for said treating agent or the like, said hollowfluid passage being bounded by and defined by a pair of spacedsubstantially parallel walls which are flat in the direction of flow ofsaid fluid stream, whereby to reduce resistance to the flow of saidfluid stream past said nozzle, corresponding longitudinal edges of saidspaced parallel walls being connected to each other by arcuate walls inbounding relation to

1. An injection nozzle for use in injecting a treating agent or the likeinto a fluid stream passing through a conduit or the like, saidinjection nozzle being adapted to be mounted with its longitudinal axisextending in a direction inwardly of the periphery of said conduit orthe like and into said stream, said nozzle including a discharge openingwhich is cut on a bias relative to the longitudinal axis of said nozzle,whereby said discharge opening is elongated in said direction todistribute the treating agent into said fluid stream along an elongatedpath extending in said direction, said injection nozzle including ahollow fluid passage for said treating agent or the like, said hollowfluid passage being bounded by and defined by a pair of spacedsubstantially parallel walls which are flat in the direction of flow ofsaid fluid stream, whereby to reduce resistance to the flow of saidfluid stream past said nozzle, corresponding longitudinal edges of saidspaced parallel walls being connected to each other by arcuate walls inbounding relation to said hollow fluid passage.